package com.good.webapi.config;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.TokenExpiredException;
import com.auth0.jwt.interfaces.DecodedJWT;
import com.good.domain.service.IAdminUserService;
import com.good.domain.service.IPassToken;
import com.good.domain.service.IUserLoginToken;
import com.good.webapi.Models.Audience;
import com.good.webapi.Models.TokenUser;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

public class AuthenticationInterceptor implements HandlerInterceptor {
    @Autowired
    private IAdminUserService iAdminUserService;
    @Autowired
    private Audience audience;
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) throws Exception {
        String token = httpServletRequest.getHeader("Authorization");// 从 http 请求头中取出 token
        // 如果不是映射到方法直接通过
        if (!(object instanceof HandlerMethod)) {
            return true;
        }
        HandlerMethod handlerMethod = (HandlerMethod) object;
        Method method = handlerMethod.getMethod();
        //检查是否有passtoken注释，有则跳过认证
        if (method.isAnnotationPresent(IPassToken.class)) {
            IPassToken passToken = method.getAnnotation(IPassToken.class);
            if (passToken.required()) {
                return true;
            }
        }
        //检查有没有需要用户权限的注解
        if (method.isAnnotationPresent(IUserLoginToken.class)) {
            IUserLoginToken userLoginToken = method.getAnnotation(IUserLoginToken.class);
            if (userLoginToken.required()) {
                // 执行认证
                if (token == null) {
                     throw  new MyException(401,"无token，请重新登录");
                }
                // 获取 token 中的 user id
                String userId;
                try {
                    userId = JWT.decode(token).getIssuer();
                    JWTVerifier verifier = JWT.require(Algorithm.HMAC256(audience.getSecretKey())).withIssuer(userId).build();
                    DecodedJWT jwt = verifier.verify(token);
                    TokenUser tokenUser = new TokenUser();
                    tokenUser.setUserId(Long.valueOf(jwt.getIssuer()));
                    tokenUser.setNickName(jwt.getClaim("data").asString());
                }catch (JWTDecodeException  | TokenExpiredException e) {
//                    throw new RuntimeException("401");
                    throw  new MyException(401,e.getMessage());
                }

            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest,
                           HttpServletResponse httpServletResponse,
                           Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest,
                                HttpServletResponse httpServletResponse,
                                Object o, Exception e) throws Exception {
    }
}